Upright exercise bike



FIG. 1 is a perspective view of the front of the upright exercise bike.

FIG. 2 is a perspective view of the rear of the upright exercise bike.

FIG. 3 is a rear view of the upright exercise bike.

FIG. 4 is a front view of the upright exercise bike.

FIG. 5 is a top view of the upright exercise bike; and,

FIG. 6 is a right side view of the upright exercise bike, with the left side view being a mirror image thereof except that the pedals are in the opposite position.

The broken line showings of foot straps are for illustrative purposes only and form no part of the claimed design. 

The ornamental design of an upright exercise bike, as shown and described. 